Technical Support Document (TSD) for West Virginia's Portion ofthe Weirton-Steubenville WV-OH Nonattainment Area's PM2.5 State Implementation Plan (SIP) Base Year Inventory

Submitted June 2009 by the West Virginia Department ofEnvironmental Protection

TSD Prepared July 2010 by Alice H. Chow Office ofAir Monitoring and Analysis, 3AP40 U.S. Environmental Protection Agency, Region 3 1650 Arch Street Philadelphia, Pennsylvania 19103

Reviewed by alter Wilkie, Associate Director Office ofAir Monitoring and Analysis, 3AP40

# ~f2,Wt**v** Date SignedI. Introduction

The purpose ofthis document is to provide a technical summary ofthe Office of Air Monitoring and Analysis (OAMA) review ofthe Base Year emissions inventories submitted with West Virginia's portion ofthe Weirton-Steubenville Nonattainment Area's (Weirton area) PM2.5 SIP by the West Virginia Department ofthe Environmental Protection (WVDEP)

. This review determines the approvability ofthe SIP Base Year Inventory and an evalJation ofthe methods used. A SIP Base Year Inventory is the starting point from which other SIP inventories are derived as well as serving as the benchmark for other SIP planning activities, such as the establishment ofan emissions reduction credit program. On January 5, 2005 the West Virginia's portion ofthe Weirton-Steubenville's nomittainment area, comprised ofBrooke and Hancock Counties,

was designated as nonattainment for the PM2.5 NAAQS. Any questions pertaining to this technical summary shouldbe directed to Walter K. Wilkie, Associate Director, Office of Air Monitoring and Analysis, at 215-814-2150 or via email at wilkie.walter@epa.gov.

II. 2002 SIP Base Year Inventory

The SIP base year inventory is .the primary inventory from which other inventories (3-year cycle inventories
,reasonable further progress inventories, modeling inventories) are derived. The Clean Air Act calls for State, local, and Tribal agencies to

ensure that the base year inventory is comprehensive, accurate, and current for all actual emissions. 1 The base year inventory includes emissions estimates from stationarypoint and nonpoint sources, onroad mobile sources, and nonroad mobile sources. For the PM2.5 NAAQS
, the pollutants to be inventoried are PM 10, PM2.5, VOC, NOx, S02 and NH3

. For the NAAQS, emissions should be reported as actual annual emissions. In the Weirton area SIP the base year used was 2002. WVDEP provided apoint

source inventory for 2002 that contained emissions for electric generating units (EGUs) and Non-EGU sources. There are two EGU sources in the Weirton area. ForEGUs and Non-EGUs WVDEP supplied datato EPA's National Emissions Inventory (NEI) for 2002, as required bythe Consolidated Emissions Reporting Rule (CERR). West Virginia submitted filterable PM emissions that were augmented byMACTEC for VISTAS to develop primaryPM estimates. For the 2002 area source emissions, WVDEP used 2002 NEI data developed by the EPA as the starting point for the area source inventory. West Virginia updated estimates for the Residential Fuel/Wood Combustion categories for coal, distillate oil, natural gas, and wood from the 2002 preliminary NEI file. NH3 emissions estimates were calculated using the Carnegie Mellon UniversityNH3 model. WVDEP used a two step process to develop the Nonroad Mobile source inventory used in this request. First the emissions for the nonroad source categories that are included in EPA's NONROAD2005 Model (NONROAD) were developed. NONROAD estimates fuel consumption and emissions oftotal hydrocarbons, carbon monoxide, nitrogen oxides, sulfur dioxide, and particulate matter for all nonroad mobile source categories except for aircraft; locomotives, and commercial marine vessels (CMV). The

1 "Emissions Inventory Guidance for Implementation of Ozone andParticulateMatterNationalAmbient Air Quality Stand ard s (NAAQS) andRegional Haze Regulations

." EPA-454/R-05-001
, August 2005second step was to develop emissions that were not contained in the NONROAD Model. Aircraft, locomotives, and commercial marine vessels (CMV) emission estimates submitted byWVDEP were developedbyE.H. Pechan and AssoCiates for VISTAS

. OAMA staffreviewed the documentationprovided concerning this portion ofthe Nonroad inventory andbelieves that it is reasonable to use these emission estimates. The MOBILE6 module ofthe SMOKE model was used to develop the onroad mobile source emissions estimates for NOx , NH3, S02, PM, and VOC emissions. MOBILE 6.2 defaults were used for the speed, vehicle age and vehicle mix data. The 2002 vehicle miles traveled (VMT) was obtained from the West VirginiaDepartment of Transportation (WVDOT) and provided along with West Virginia-specific temperature data. Mobile emissions values were given annually by SCC. AQAB staffreviewed the files and emission results.